I tend to ignore the ratings. I don't really think a movie is going to just become bad if they shoot for a PG-13 or 12A rating. There are some really good movies that have been rated PG-13 that would have been just as good rated R, and there have been some horrible rated R movies that would have been just as bad rated PG-13.
Are most of the movie theaters you guys go to really that strict on the rating system? My movie theater IDs, but I never thought of it as that serious.